Illus. and text in: Harmonices mundi / Johann Kepler. Lincii Austriae : J. Plancus, 1619, p. 207. Published in: The tradition of science / Leonard C. Bruno. Washington, D.C. : Library of Congress, 1987, p. 35.
Français : Souvenirs de la Sicile - Arriette
Bild aus Seite 639 in "Die Gartenlaube". Image from page 639 of journal Die Gartenlaube, 1859. Deutsch: keine Bildunterschrift English: no caption
Русский: Иллюстрация к статье Гамма, в музыке 1-го издания Большой советской энциклопедии English: Figure from Гамма, в музыке article of Great Soviet Encyclopedia, 1st edition
Logarithmic spiral of musical tone Public domain photograph related to music, performing arts, free to use, no copyright restrictions image - Picryl description